attribute vec3 position3DHigh;
attribute vec3 position3DLow;
attribute float batchId;
attribute vec4 color;
varying vec4 v_color;

void main() {
  vec4 pos = czm_computePosition();   // 返回当前这个顶点的位置
  v_color = color;
  gl_Position = czm_modelViewProjectionRelativeToEye * pos;
}
